Statics › Section J · Moments of inertia › Topic J.6
Radius of gyration
A moment of inertia in mm⁴ is hard to picture. The radius of gyration turns it back into an ordinary distance, and that distance decides which way a column will buckle and how much load it can take.
In this topic
- A distance instead of a fourth power
- The definition
- Three radii, one relation
- Common shapes
- Worked example: a rectangular bar
- Moving the axis
- Why columns care
- Worked example: square bar or tube
- Mass radius of gyration
- Common mistakes to avoid
- Key takeaways
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